package util;

import com.google.common.collect.Maps;
import lombok.extern.slf4j.Slf4j;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/**
 * Created by Administrator on 2021/4/22.
 */
@Slf4j
public class HttpClientUtil {

    private static String url = PropertiesUtil.getProperty("host");

    public static String sendRequest(String req, String idNo){
        //用于验证的账号
        Map map = Maps.newHashMap();
        map.put("username", PropertiesUtil.getProperty("username"));
        map.put("password", PropertiesUtil.getProperty("password"));

        if (idNo != null){
            map.put("idNo", idNo);
        }

        //发送请求
        String result = HttpClientUtil.sendPost(url + req, map);

        return result;
    }

    public static String sendRequest(String req){
        return sendRequest(req, null);
    }

    public static String sendGet(String url, Map param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?";
            for(Object paramKey:param.keySet()) {
                if((param.get(paramKey)+"").length() !=0 &&param.get(paramKey)+""!=null&&param.get(paramKey)+""!="") {
                    urlNameString += paramKey+"="+(param.get(paramKey)+"")+"&";
                }
            }
            //去除最后一次增加的&
            if(urlNameString.endsWith("&")) {
                urlNameString=urlNameString.substring(0, urlNameString.length()-1);
            }
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            log.error("发送GET请求出现异常！" + e);
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                log.error("关闭输入流错误", e);
            }
        }
        return result;
    }

    /**
     * 发送post请求
     * @param url
     * @param reqParam
     * @return
     */
    public static String sendPost(String url, Map reqParam) {
        String jsonParam = JsonUtil.objToString(reqParam);
        System.out.println(jsonParam);
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "application/json, text/javascript, */*; q=0.01");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());

            //发送请求参数
            out.print("jsonParam=" + jsonParam);

            out.flush();
            // 定义BufferedReader输入流来读取URL的响应，设置字符集
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            log.error("发送 POST 请求出现异常！" + e);
        }
        // 使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                log.error("关闭流错误", ex);
            }
        }
        return result;
    }
}
